"And he does a fantastic job in that role. He knows it. He understands it. And also very important – Sean is able to physically do something most actors aren't able to do, which is waddle around on all fours.

"He's always been an incredibly limber guy that can do a lot of strange physical things. And the fact that he's able to waddle around on his legs all day long at the exact height of Rocket is quite a feat and quite difficult."